A source at the National Iranian Oil Company (NIOC) reportedly told Reuters that a virus was detected inside the control systems of Kharg Island oil terminal, which handles the majority of Iran’s crude oil exports. In addition, computer systems at Iran’s Oil Ministry and its national oil company were hit.

Oil Ministry spokesman Ali Reza Nikzad-Rahbar told Mehr News Agency on Monday that the attack had not caused significant damage and the worm had been detected before it could infect systems.